[Live-devel] How to sync H264 and AAC timestamp from live streaming

[Eric_Hsieh at alphanetworks.com]

Dear Ross,

From your previous suggestions, if we want to deliver live streaming out via live555,
we should use H264VideoStreamDiscreteFramer and set fDurationInMicroseconds to be 0.
Now, our RTSP server stream H264+AAC works well with one client.
If there is the second client to connect our server, first client’s video will freeze.
If the second client close the player, first client’s video will resume working again.

I try to figure out why this issue will happen.
I got the reason because doGetNextFrame will be blocked until the live data is ready.
H264 frame may block 33ms, AAC frame may block 128ms.

Then, I try to resolve this issue.
I set H264’s fDurationInMicroseconds to be 33ms, AAC’s fDurationInMicroseconds to be 128ms.
The first client’s video will freeze forever.

If the server stream video only with fDurationInMicroseconds 33ms, it works well with multi client.
If the server stream audio only with fDurationInMicroseconds 128ms, it also works well with multi client.

Any suggestions? Please help. That would be very great.
Thanks a lot.

regards, eric, 10/21

On Oct 6, 2015, at 20:32, Ross Finlayson <finlayson at live555.com<mailto:finlayson at live555.com>> wrote:

Now, we use H264VideoStreamDiscreteFramer to do live streaming, it is better than before.
And we sure the timestamp is correct and sync with “wall clock time”.
But, we still have some questions, need your help.
1. Now, H264+AAC is working well.
    After playing about 3 hours, audio is good but video will not very smooth to play.
    Do you have any suggestions?

Are you absolutely sure that your “fPresentationTime” values - for both audio and video - remain accurate even after 3 hours?  (In particular, watch out for accumulated truncation errors.)

If you’re sure that your “fPresentationTime”s are accurate, then sorry, I don’t have any other suggestion; perhaps the problem is with your client application?

2. We still need to stream JPEG+AAC live streaming.
    After playing 2 minutes, video will block which is same with H264+AAC issue.
    There is no DiscreteFramer class for JPEG streaming, do you have any suggestions?

Yes - my suggestion is not to stream JPEG; it’s a bad idea.  See:
http://live555.com/liveMedia/faq.html#jpeg-streaming


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/

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